是否有可能在R中创建一个没有连续数据的三维轮廓图? [英] Is it possible to create a 3d contour plot without continuous data in R?

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问题描述

我想用x,y,z数据创建变量z的轮廓。然而,似乎我们需要按递增顺序提供数据。



我试着使用一些代码,但它给了我错误。



我尝试了以下代码:试用1:

  age2100 < -  read.table( temp.csv,header = TRUE,sep =,)

x< - age2100 $ x
y< - age2100 $ y
z< - age2100 $ z

contour(x,y,z,add = TRUE,col =black)

我得到以下错误:

  contour.default中的错误(x,y,z,add = TRUE,col =black):增加预期的'x'和'y'值

然后尝试使用ggplot2创建轮廓。我使用了下面的代码:

  library(ggplot2)
library(MASS)
库(rgdal)
库(gpclib)
库(maptools)
age2100< - read.table(temp.csv,header = TRUE,sep = ,)
v < - ggplot(age2100,aes(age2100 $ x,age2100 $ y,z = age2100 $ z))+ geom_contour()
v

我收到以下错误消息:

警告消息:

 无法生成轮廓数据

请在以下位置):

  source(image.scale.R)# http://menugget.blogspot.de/2011/08/adding-scale-to-image-plot.html 

x11(width = 5,height = 6)
布局(矩阵(c(1,2),nrow = 1,ncol = 2),widths = c(4,1),height = 6,respect = TRUE)
layout.show(2)

par(mar = c(4,4,1,1))
image(fld)
contour(fld,add = TRUE)
points(age2100 $ x,age2100 $ y ,bch =。,cex = 2)

par(mar = c(4,0,1,4))
image.scale(fld $ z,xlab = ,ylab =,xaxt =n,yaxt =n,horiz = FALSE)
box()
axis(4)
mtext(text,side = 4 ,line = 2.5)


I want to create a contour of variable z with the x,y,z data. However, it seems like we need to provide the data in increasing order.

I tried to use some code but it gave me the error.

I tried the following code: Trial 1:

age2100 <- read.table("temp.csv",header=TRUE,sep=",")

x <- age2100$x
y <- age2100$y
z <- age2100$z

contour(x,y,z,add=TRUE,col="black")

I got the following error

Error in contour.default(x, y, z, add = TRUE, col = "black") : increasing 'x' and 'y' values expected

I then tried to use ggplot2 to create the contour. I used the following code:

library("ggplot2")
library("MASS")
library("rgdal")
library("gpclib")
library("maptools")
age2100 <- read.table("temp.csv",header=TRUE,sep=",")
v <- ggplot(age2100, aes(age2100$x, age2100$y,z=age2100$z))+geom_contour()
v

I got the following error:

Warning message:

Not possible to generate contour data 

Please find the data on the following location https://www.dropbox.com/s/mg2bo4rcr6n3dks/temp.csv

Can anybody tell me how to create the contour data from the third variable (z) from the temp.csv ? I need to do these many times so I am trying to do on R instead of Arcgis.

解决方案

Here is an example of how one interpolates using interp from the akimapackage:

age2100 <- read.table("temp.csv",header=TRUE,sep=",")

x <- age2100$x
y <- age2100$y
z <- age2100$z

require(akima)

fld <- interp(x,y,z)

par(mar=c(5,5,1,1))
filled.contour(fld)

Here is an alternate plot using the imagefunction (this allows some flexibility to adding lower level plotting functions (requires the image.scale function, found here):

source("image.scale.R") # http://menugget.blogspot.de/2011/08/adding-scale-to-image-plot.html

x11(width=5, height=6)
layout(matrix(c(1,2), nrow=1, ncol=2), widths=c(4,1), height=6, respect=TRUE)
layout.show(2)

par(mar=c(4,4,1,1))
image(fld)
contour(fld, add=TRUE)
points(age2100$x,age2100$y, pch=".", cex=2)

par(mar=c(4,0,1,4))
image.scale(fld$z, xlab="", ylab="", xaxt="n", yaxt="n", horiz=FALSE)
box()
axis(4)
mtext("text", side=4, line=2.5)

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